Add comment for parameter, correct spelling in comment.

server/core/dcb.c

@@ -163,6 +163,7 @@ dcb_get_zombies(void)
  * This routine performs the generic initialisation on the DCB before returning
  * the newly allocated DCB.
  *
+ * @param dcb_role_t	The role for the new DCB
  * @return A newly allocated DCB or NULL if non could be allocated.
  */
 DCB *

server/include/server.h

@@ -118,7 +118,7 @@ typedef struct server {
  */
 #define	SERVER_IS_RUNNING(server)	(((server)->status & (SERVER_RUNNING|SERVER_MAINT)) == SERVER_RUNNING)
 /**
- * Is the server marked as down - the macro returns true if the server is beleived
+ * Is the server marked as down - the macro returns true if the server is believed
  * to be inoperable.
  */
 #define	SERVER_IS_DOWN(server)		(((server)->status & SERVER_RUNNING) == 0)